CCOPPS: Creep Loading of Pressurized Components - Phenomena and
Evaluation
CCOPPS Project
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Event Type:Webinar
Location: Online,UK
Date: July 23, 2008
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Creep is defined as plastic (permanent) deformation occuring at
high temperature under a constant load over a long time period. For
pressurized components operating in the high temperature regime
creep is the governing damage mechanism. Thus design and life time
assessment have to be based on the correct understanding of the
basic phenomena of creep but also on the specific relationship to
e.g. material conditions and the interaction to other relevant
damage mechanisms.
Part 1 of the presentation refers to the basics of creep. By means
of uniaxial creep tests the creep behaviour and rupture
characteristics will be gained. The main stages: development of
plastic creep deformation and the link to the changes in the
microstructure, formation of creep cavities mainly at grain
boundaries and subsequent micro cracks, creep crack growth and
failure will be described. The main influencing parameters as
material state and the temperature and their impact on creep
strength will be shown. The problem of long term extrapolation and
creep rupture data scattering will be discussed, as well as the use
of these data in the formulation of the “user models”
in the non-linear FE-analysis.
In Part 2 the problem of transferability to components will be
treated. This relates to the possibilities and limitations of
detection of the first stages of creep damage by means of non
destructive methods but also to the risk of premature creep failure
in the heat affected zone of fully weldments.
Part 3 deals with creep laws and models for the FE simulation and
numerical (FE) computation of creep loaded components considering
the effects of multiaxial stress state and creep damage
development.
Agenda
Introduction and CCOPPS Update
Prof. Aleksandar Jovanovic, Director of Steinbeis Advanced Risk
Technologies
Creep Loading of Pressurized Components - Phenomena and Evaluation
Prof. Karl Maile, MPA University of Stuttgart
Q & A Session
Closing
1 This webinar is the thrid in a series of four sponsored by the
CCOPPS project, which is funded by the EU under the Leonardo
initiative. The project is focussed on the development of the
competence of users of FEA in the power and pressure systems
industry. The project partners are the University of Strathclyde,
University of Malta, University of Stuttgart, Technical University
of Warsaw, CETIM and NAFEMS.
www.CCOPPS.eu
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